Compilare: user.cpp: In function ‘void dfs2(int)’: user.cpp:94:15: warning: unused variable ‘cnt’ [-Wunused-variable] int u, i, cnt; ^ user.cpp: In function ‘int main()’: user.cpp:129:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cerere.in", "r", stdin); ^ user.cpp:130:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cerere.out", "w", stdout); ^ user.cpp: In function ‘void cit(int&)’: user.cpp:16:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(ax, 1, dim, stdin), pz = 0; ^ user.cpp:20:45: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(ax, 1, dim, stdin), pz = 0; ^